The absorption spectra of nitric oxide in aromatic and aliphatic hydrocarbons, in alcohols and in water were investigated. The experimental results show that the broad structureless absorption bands observed rise from charge transfer between the solvent and NO. Thermochemical data indicate that the solvent-NO interactions are due to contacts in solution without the formation of a stable complex. The charge transfer spectra of NO and O2 solution are compared. The enhancement of singlet-triplet transitions of benzene and the quenching mechanism of triplet states by NO are considered briefly.